Boot ISO from GRUB2

Hi everyone!

I'm trying to add the option to boot RedHat ISO from USB disk and NTFS partition to GRUB2 like this:
menuentry 'Red Hat' --class redhat --class gnu-linux --class gnu --class os {
set isofile="/_ISO/LINUX/RedHat-9.5-x86_64-boot.iso"
insmod loopback
search --no-floppy -f --set=root $isofile
loopback loop (${root})$isofile
linux (loop)/images/pxeboot/vmlinuz iso-scan/filename=${isofile} root=live:CDLABEL=RHEL-9-5-0-BaseO ro rd.live.image quiet nomodeset
initrd (loop)/images/pxeboot/initrd.img
}

The download stops at the message (see attached photo )

How to fix it?